------------------------------------- geothermal energy as an electricity source in the region of...
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-------------------------------------Geothermal energy
as an electricity source in the region of Slovakia
-------------------------------------
Beladice, 2011
Geophysical institute of SAS
the mean temperature gradient at the Earth’s surface is about 30˚ C per 1 km(up to 100 ˚ C in the depth of 3 km and about 300 ˚ C in the depth level of 10 km)
the geothermal sources for classical production of electricity are accessible at the depth level 10 -12 km
usual depths of bore holes are up to 3 - 5 km; deeper (>10 km) ones are now exceptional
geothermal capacity of the Earth: all consumption of energy (past and future) should cause decrease of the mean temperature of the Earth only one degree in 40 milion years.....
1 - hydro-geological source 2 - “hot dry rock” source
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Classification of geothermal sources according the utilization potential
In 1904 emerging steam was used to turn a small turbine which powered five light bulbs - the first ever demonstration of geothermal electricity generation. (Larderello, Italy) - - - - - - - - - - - - - - - - - - >
The world's first geothermal power station was
built in 1911 in Larderello, in Southern Tuscany, Italy and later …
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(in 1913) a 250kW power station had been built which provided power for the Italian electric
railway system.
Typical production of electric power
Husavik, nordth Island; 2MW – 80 percent of town electricity consumption (~2000 inhabitants)
120 ˚C – 80 ˚C; 90 kg/s; Kalina cycle technology
Kalina cycle – process diagram, Husavik
Production well
Reinjection well
Pump
Regenerator
Turbine
Warming-up
Separator
Binary cycle application regions in Slovakia(minimal required depth distributions)
Classic cycle application regions in Slovakia(minimal required depth distributions)
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